某高耸钢结构塔架的动力特性对比研究(任务书,开题报告,论文11000字)
摘要
电力系统的安全运行关乎着国计民生和国家安全，而输电塔作为电力系统的重要脉络，它的安全问题直接影响着电力系统的安全运行。输电塔作为一种典型的钢结构高耸塔架，其高柔特性使得它在强风强震作用下的动力响应较为显著，严重的还会发生倒塌破坏。而影响结构动力响应的主要因素之一便是其动力特性，所以为了减少输电塔的倒塌破坏给社会经济带来的重大损失，对高耸钢结构输电塔架进行动力特性研究的必要性已经毋庸置疑，这也正是当前学术界研究的热点问题。
本文以220kV湛江电厂至赤坎某座型号为GUT4-14的输电塔架为研究目标，开展输电塔架的动力特性研究。本文运用有限元软件SAP2000建立输电杆塔有限元模型，对其进行模态分析，分析输电杆塔的自振特性，这是研究结输电塔动力特性的重要步骤。通过研究该输电塔的自振周期、频率和和振型，我们能够确定它的动力特性，为实际设计施工过程提供理论上的依据，这样就能够有效减少输电塔因在强风强震作用下的强烈动力响应而造成的倒塌破坏，避免因输电塔的倒塌而给社会经济带来重大损失。
关键词：输电塔；有限元分析；相似模型；动力特性。
Abstract
The safe operation of the power system is related to the national economy and national security, and the transmission tower as an important vein of the power system, its security issues directly affect the safe operation of the power system. Transmission tower as a typical steel structure towers, its high softness makes it under strong wind and strong earthquake under the dynamic response is more significant, serious collapse will occur. And one of the main factors that affect the dynamic response of the structure is its dynamic characteristics. Therefore, in order to reduce the damage caused by the collapse of the transmission tower to the social economy, the necessity of studying the dynamic characteristics of the high-rise steel transmission tower has been beyond doubt , Which is the current academic research hot issues.
In this paper,a model of 220kV Zhanjiang Power Plant to Chikan for the GUT4-14 transmission tower as the research objectives, to carry out the power transmission tower characteristics. In this paper, the finite element software SAP2000 is used to establish the finite element model of the transmission tower, and its modal analysis is carried out to analyze the vibration characteristics of the transmission tower. This is an important step to study the dynamic characteristics of the transmission tower. By studying the self-vibration period, frequency and vibration modes of the transmission tower, we can determine its dynamic characteristics and provide the theoretical basis for the actual design and construction process, so that it can effectively reduce the influence of the strong earthquake Strong dynamic response caused by the collapse of the destruction, to avoid the collapse of the transmission tower to the social and economic losses.
Keywords:transmission tower; finite element analysis; similarity model; dynamic characteristics
目录
第一章 绪论 1
1.1 引言 1
1.2 输电塔的基本信息 1
1.3 国内外研究现状 2
1.4本文主要工作 3
第二章 输电塔的有限元模型 4
2.1引言 4
2.2有限元分析原理 4
2.2.1有限元分析的概念 4
2.2.2有限元分析的目的 4
2.2.3有限元分析的基本步骤 5
2.3 SAP2000的基本介绍 6
2.4 输电塔的分析原理 6
2.3.1基本原理 6
2.3.2空间梁单元 7
2.3.3空间杆单元 9
2.5输电塔有限模型的建立 10
第三章 输电塔的动力特性分析方法 11
3.1引言 11
3.2输电塔的自由振动方程 11
3.3输电塔的广义特征值的求解问题 12
第四章 相似模型 14
4.1引言 14
4.2相似比原理 14
4.3模型相似比的选取 15
4.4相似模型的实体结构 17
第五章 输电塔的动力特性 18
5.1无附加质量输电塔原始塔的动力特性 18
5.2无附加质量输电塔塔缩尺塔的动力特性 24
5.3有附加质量输电塔原始塔的动力特性 31
5.4有附加质量输电塔缩尺塔的动力特性 36
5.5有无附加质量的动力特性对比 43
5.6原始塔和缩尺塔动力特性对比 45
第六章 结论与展望 47
6.1结论 47
6.2展望 47
参考文献： 49
致谢 50 |
